| Ponera scabra|
Wheeler, W.M., 1928
Collected but a few times, little is known about Ponera scabra.
|At a Glance||• Facultatively polygynous|
Taylor (1967) - A Japanese species closely related to, and possibly cognate with, Ponera chapmani. Distinguished in general from other Ponera species by the combination of moderately large size (head width 0.61-0.64 mm in worker, 0.71-0.74 mm in queen), heavy sculpturing, and long scapes, which almost exactly reach the median occipital border. Readily differentiated from the only other known Japanese species, Ponera japonica, by its larger size (head width 0.42-0.50 in japonica) and heavier sculpturation. P. scabra may be differentiated from the related chapmani by characters stated below in the worker description.
Keys including this Species
Distribution based on Regional Taxon Lists
Distribution based on specimens
The general biology of species in the genus was summarized by Taylor (1967): Ponera are small ants that nest in rotting logs in forested areas or under stones in nonforested situations. In the tropical areas specimens are rarely encountered away from rain forest. In temperate areas, however, species may occur in relatively lightly forested areas. This appears to be the case with Ponera japonica, Ponera pennsylvanica and especially with Ponera coarctata. The Australian Ponera leae is essentially limited to rain forest in the northern parts of its range, but further south it may be found in dry, lightly forested areas.
Foraging is probably cryptobiotic, though some New Guinea species have been taken straying on the ground surface. Little information is available concerning feeding. However, most species are probably insectivorous. I have conducted feeding experiments with some of the New Guinea and Samoan species, including Ponera xenagos, Ponera elegantula, Ponera tenuis, Ponera incerta and Ponera woodwardi. These were unsuccessful with the larger species, except elegantula, which accepted moderately large (8-12 mm) campodeid and japygid Diplura. Tenuis and incerta accepted smaller (4-6 mm) campodeids, isotomid and sminthurid Collembola, and small newly hatched spiders (2 mm long). Negative feeding response was obtained with eggs and larvae of various ants, small crushed insects of various orders, and small myriapods. Stray workers were never observed carrying prey, and distinct middens of insect or other remains were not located near nests.
Colonies usually contain about 30 workers. Larvae and pupae are not segregated in most cases, but occasionally aggregations of pupae were observed. These may have included the total brood of the colonies involved. Larvae are attached to the floor or walls of the nest galleries by the glutinous abdominal tubercles described above, and the ants move them high up on the walls or ceilings of artificial nests, if they are flooded. Details of nuptial behavior of pennsylvanica were given by Wheeler (1900), and Haskins & Enzmann (1938). The flights appear to be of a pattern typical for ants, with the alates meeting in the air and mating there or on the ground. Colony foundation is non-claustral and independent in pennsylvanica (Kannowski 1959); judging from my observations this is typical for the genus.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- scabra. Ponera scabra Wheeler, W.M. 1928d: 99 (w.q.) JAPAN. Santschi, 1937h: 364 (gynecoid w.); Santschi, 1941: 273 (q.); Ogata, 1987: 121 (m.); Imai & Kubota, 1972: 194 (k.). Senior synonym of yakushimensis: Yoshimura, Hosoishi, et al. 2009: 195. See also: Wilson, 1957b: 381; Taylor, 1967a: 49.
- yakushimensis. Ponera yakushimensis Tanaka, 1974b: 32, fig. 1 (w.q.) JAPAN. Junior synonym of scabra: Yoshimura, Hosoishi, et al. 2009: 195.
Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.
1. The 3 large apical mandibular teeth occupy about 1/3 of the masticatory border, and are followed by a series of 10-12 minute denticles.
2. Median clypeal denticle much less pronounced, at least in smaller specimens (see below).
3. Scapes relatively short; when laid back along head they almost exactly reach the median occipital border.
4. Head narrower (cephalic index 78-83 opposed to 83-85 in chapmani).
5. Mesometanotal suture much less distinctly incised, although indicated by a break insculpturation.
6. Posterior border of node, viewed from above, distinctly concave. Node relatively wide (petiolar node index 84-89 opposed to 79-80 in chapmani).
7. Sculpturation of mesosoma and node much more pronounced; striae of propodeal declivity and posterior face of node lacking (see Wilson's description).
The posterior face of node with fine transverse superficial "scaly" sculpturation, like that on propodeal declivity of Ponera alpha, but more distinctly developed. This sculpturation, which probably represents a vestigial striate-rugosity, is more distinct on the lower 1 /2 of face than above.
Additional description. The following notes are based on 7 syntype workers and 2 dealated syntype queens from the MCZ and AMNH collections. An additional unstudied syntype worker is in the USNM collection (M. R. Smith, in litt). Wheeler presumably returned some of his types to Silvestri and it is not known whether he designated a holotype. Accordingly, no lectotype selection has been made here.
Syntypes (figs. 31, 32). In addition to the features indicated in the diagnosis above the following details should be noted: HL 0.77-0.80 mm; HW 0.61-0.64 mm; SL 0.56-0.59 mm; CI 78-80; SI 90-93; PW 0.46-0.50 mm; PNL 0.26-0.28 mm; PH 0.49-0.53 mm; DPW 0.39-0.43 mm; PNI 84-88.
Eyes about 0.03 mm in diameter, with 3-5 indistinct facets. Median clypeal tooth at best vestigial, represented by a low flat tumosity ; a little more distinct in larger specimens. Antennal club as described for chapmani. General form of propodeum as in chapmani; petiolar node somewhat bulkier (cf. figs. 30, 32).
Additional workers. 2 workers from Hikosan, Kyushu (K. Yasumatsu) have the following dimensions : HL 0.78 mm, 0.84 mm; HW 0.64 mm, 0.70 mm; SL 0.57 mm, 0.61 mm; CI 82, 83; SI 89, 87; PW 0.49 mm, 0.55 mm; PNL 0.25 mm, 0.30 mm; PH 0.51 mm, 0.55 Mm; DPW 0.44 mm, 0.47 mm; PNI 89, 85. These specimens agree well with the syntypes but have relatively high CI and low SI values. The larger specimen is probably slightly gynecoid; its eyes are about 0.05 mm long with 7 rather distinct facets, and the median clypeal denticle is well developed, as in queen. The palpal formula (smaller specimen dissected): Maxillary 2 : Labial 2.
Taylor (1967) - Differentiated from queen of Ponera chapmani by larger size and the same mandibular, scape, nodal and sculptural characters which distinguish the worker. Compound eye distinctly smaller, its maximum diameter 0.25 to 0.26 X head width, opposed to 0.29 to 0.30 X HW in chapmani. Wing venation unknown (unfortunately; considering the peculiar venation of chapmani).
Syntypes (N = 2): HL 0.87 mm; HW 0.71 mm, 0.74 mm; SL 0.64 mm, 0.65 mm; CI 82, 85; SI 90, 88; PW 0.60 mm, 0.66 mm; single measurements (1st specimen) for PNL 0.30 mm and PH 0.60 mm; DPW 0.51 mm, 0.55 mm; PNI 85, 83; maximum diameter of compound eye 0.18 mm; 0.19 mm; ocular index 25, 26.
Differing from the workers in the usual characters, and from other Ponera queens by the characters of the diagnosis above. The palpal formula has not been checked.
Taylor (1967) - The records of Ponera scabra published in the important ecological studies of Hokkaido ants by Hayashida (1957, 1960) were in fact based on incorrectly determined specimens of Ponera japonica, which were generously made available for this study by Dr Hayashida. For further information see japonica.
- Imai, H. T.; Kubota, M. 1972. Karyological studies of Japanese ants (Hymenoptera, Formicidae) III. Karyotypes of nine species in Ponerinae, Formicinae and Myrmicinae. Chromosoma (Berl.) 37: 193-200 (page 194, karyotype described)
- Ogata, K. 1987a. A generic synopsis of the poneroid complex of the family Formicidae in Japan (Hymenoptera). Part 1. Subfamilies Ponerinae and Cerapachyinae. Esakia 25: 97-132 (page 121, male described)
- Santschi, F. 1937h. Fourmis du Japon et de Formose. Bull. Ann. Soc. Entomol. Belg. 77: 361-388 (page 364, gynecoid worker)
- Santschi, F. 1941. Quelques fourmis japonaises inédites. Mitt. Schweiz. Entomol. Ges. 18: 273-279 (page 273, queen described)
- Taylor, R. W. 1967a. A monographic revision of the ant genus Ponera Latreille (Hymenoptera: Formicidae). Pac. Insects Monogr. 13: 1-112 (page 49, see also)
- Wheeler, W. M. 1928d. Ants collected by Professor F. Silvestri in Japan and Korea. Boll. Lab. Zool. Gen. Agrar. R. Sc. Super. Agric. 22: 96-125 (page 99, worker, queen described)
- Wilson, E. O. 1957b. The tenuis and selenophora groups of the ant genus Ponera (Hymenoptera: Formicidae). Bull. Mus. Comp. Zool. 116: 355-386 (page 381, see also)